Method of and apparatus for making cores.



J. G. BANNISTER. METH OD OF AND APPARATUS FOR MAKING corms.

I APPLICATION FILED NOV. 8, 1911.

Patented July 30, 191.2.

2 SHEETSSHEET 1.

J. G. BANNISTER.

. METHOD OF AND APPARATUS FOR MAKING 0033s.

APPLIOATION FILED NOV. 8, 1911. I 38116. 11y 1,034,335 P1: tdJl 301912 vv 2 2 3HEBTSSHEET 2.

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. position lll'tlle molds green sand cores 1s made radiant ossioiz.

JOHN o. eaivni's'rea, or Kswaims, iiimucis.

METHOD 0F AND APPARATUS FQR MAKItNG CORES.

To all whom it may concern:

Be it known that l, JOHN C. BANNISTER, a citizen of'the United States.ofAmerica, residing at Kewauee, in the county ofHenry and State ofIllinois, have invented a new and useful Method of and Apparatus forMaking Cores, of which the following is a specification.

My invention relates to the manufacture of cores used in molding,- andmore. particularly relates to a method'of making green sand cores usedlater in the manufacture of castings such aspipe fittings and similararticles and to novel apparatus constructed and arranged for use incarrying out my improved method.

Heretofore, it has been attempted to mamitacture green sand cores bymeans of an. air blast or the use of air under pressure, but suchattempts have lieeu UIlSllCCQSSfUl on account of inability to pack thesand uniformly within the core-boxes and the failure to obtain cores ofuniform density. 1 have discovered the invariable failure of suchmethods of making green sand cores is on account oi the sand beingintroduced into the core-box. cavities through openings or holesextending transversely or at an oblique angle to the ax of the cores,and owing to the necessary change in direction of the flow of the sandafter entering the core-box whichprevents the desired equal packing anduniform density of the sand.

' One object of my invention is to provide a novel method of makingcores of green sand whereby the sand is compacted within the cavities ofthe core boi: and by which cores of uniform density are made.

Another object or' this invention is to provide a novel method of makinggreen 'sand cores by the use of which a series of the cores can besimultaneously formed and later transferred from the core-boxes into forthe later casting operation. v

A further object of my invention is to provide apparatus for makinggreen sand cores by theluse of which my improved methodis employed andthe manufacture of possible.

Referring to'the' drawings, Figure 1 is a plan, partly in section, thesection being taken on the line l-I of Fig. 2, showing a two-partcore-box split lengthwise and hav ing a plurality of core-formingcavities. Fig. 2 is a longitudinal section on the ir- Specifioetion of.Letters Patent Application-filed November equally I Tlie'lower end ofPatented July 30, 1912.

s, 1911. Serial No. 659,160.

regular line Il II of Fig. 1 showing the two-part core-box,' asassembled'and applied for'use to the sand boot of a molding machine fromwhich. the molding sand is supplied in forming the cores in accordancewith my improved method. Fig-3 is a sectional end view on the irregularline lll-ll1 of Fig. 1 showing the apparatus illustrated in Figs. 1 and2.v

In the drawings, the numerals 2 and 3 designate the top and bottomsections of a sectional. or two-part core-box which is divided or splitlengthwise. The cont-acting faces of the sections 2 and registeringcavities forming a'plurality or ooreboxes 41 constructed and arrangedfor molding or forming cores, the'particular cores shown being used inmaking pipe fittings known astees. The multiple core-box formed of thesections 2 and 3 is arranged for use with the sand boot 5 of amoldingmachine and the bottom plate 6 of the sand boot 5 has a series ofopenings or holes 7 provided therein through which the sand ered into hcore-loos.

tierured on the lower face of the bottom plate 6 is a series of droptubes 8 and 9, one for each vertical opening 7, having longitudinallyinclined or tapered faces. The drop tubes 8 are arranged to extenddownwardly so that the vertically inclined taco thereon. forms the endwalls which determine the length of the cores formed in the core-hos.The double drop tubes 9 also employed have. opposite inclined faces arranged: to determine the length of the branch on the type of core shown.The drop tubes 8 9' are secured on the lower face of the bottom plate 6of the sand boot 5 and each'tube' has vertically extending opening orpassage 1.0 registering with one of the openings or passages 7 extendingtransversely through the bottom plate 6.

tubes 8 and 9 extends into transversely'ex tending passages 11 or 12 onthe lower end of the drop tubes, the transversely extend ing passages11011 the tubes 8 and passages on the tubes 9 being arranged toiextendaxially in lines parallel with the longitudi nal. axes of the core-boxcavities and the cores formed therein. I t

it will be seen loy reference to Figs. 2 and iii-hat the passageextending through 1 the drop tubes changes the direction of flow 3 haveaseries of in. the boo 5 is discharged in being deliv the passage 10 inthe drop in lines or paths formed.

spaced therein in such the core-box. The bottom section 3 of thecore-box'isprovided with handles or lugs 14 of the sand in its boot 5into the core-boxcavities, so that the sand enters into and travels inthe core-box substantially parallel to the longitudinal axes. of" thecores being The core-hex sect ons 2 and 3 are provided with a series ofopeningsfor holes 13 manner as'to reg ister with the drop tubesSaniiQeXtending downwardly therethroughf; from the lower or outer surfaceof the bottom plate 6 into by which it is manipulated and transferredmanually from place to place. The core-box section 3 is also providedwith the dowel -d pm openings 15 in the lugs 16 to insure registrationof this core-box section withthe dowel pins on the flask in transferringthe series of cores from the core-box to the mold. [In making green'sandcores in accordance with my improved method, the sections 2 and 3 of thecore-box are assembled or booked with the coreforming cavities inregistering position. The upper surface of the top section 2 of thecore-box is then brought into engagement with the lower drop tube 8 or 9opposite the times caused to enter the f "within the surface" of thebottom-plate 6 on the sand boot 5 of a molding machine. The drop tubes 8and 9 on the bottom-plate 6 project through the openings 13 in thesections of the core-box so as to bring one face of a end of a cavityforming each branch on the core for the pipe fitting orother articlebeing made. The faces of the drop tubes are made tapering to facilitateremoval after the cores have been formed and to afford a neat fitbetween the faces of the droptubes and the openings 13 in the core-boxesinto which they extend, the tubes substantially filling the openings orholes 13' The said boot 5 having been filled with sand which has beenproperly tempered or prepared, the sand is then forced or carried fromthe boot into the core-box cavities by means of air admitted theretounder pressure in accordance with the method of using the apparatus.

As the sand enters the series of openings or passages in the drop tubesthe direction in which it passes is changed within the drop tubes 8 and9. The sand is at all core-box cavities rom the drop tubes in pathssubstantially parallel to the longitudinal axes of the core-box andcores, the air entering the corelcox, depositing the sand in thecore-box, b h fcrevices or openings etween t e enga aces of the droptubes. By so doing, ilih sand is uniformly distributed and equallypacked formed thereoi" are of uniform density. It

will hy reference to the drawings" passage from the sand the endportions corehox cavities" and the cores that the sand is built; up informing the cores from the center of the cores toward the ends' of thecores and any branches thereon are-last formed, which assists Insecuring the, desired uniform density.

The advantages of'my invention will be apparent to those skilled in theart. By the peculiar manner of introducing or forcing the sand into thecore-box cavities, cores made of green sand are formed which are ofuniform density, a result not heretofore obtainable.

Modifications in the construction and arrangement of the apparatus forcarrying out my improved method may be made without eparting from theinvention as defined in the claims.

I claim 1. The method of making green sand cores consisting inintroducing the sand into a core-box by means of fluid pressure, saidsand'being introduced in paths parallel to the longitudinal axis of thecores from op.- posite ends thereof to thereby equally pack the sand andform cores of uniform density.

2. The method of making green sand cores consisting in introducing thesand under fluid pressure into core-boxes from the ends toward thecommon axial center of the cavitiesin which the cores are formed inpaths parallel to the axes of the core cavities.

3. The method of making green sand cores consisting in introducing thesand under fluid pressure into a core-box from opposite ends of thecavities in which the cores are formed and in paths parallel to the axisof the cores.

4.In apparatus for making green sand cores, the combination with acore-box having a plurality of openings leading thereinto and asand-boot to supply sand to said core-box, of means on said. sand-bootar ranged "to -deliver the sand through said openings into said core-boxin opposite directions and in paths parallel to the longitudinal centerof the core formed in said core-box.

5. In apparatus for making green sand cores the combination with acore-box having a plurality of core-forming cavities therein, andopenings leading into said c'oreforming cavities and a sand-boot tosupply sand to said cavities, of means on said sandboot arranged tosimultaneously deliver the sand through said openings into said cavitiesfrom the ends thereof in paths parallel to the longitudinal axes of themultiple cores formed in'said core-box.

6.111 apparatus for making'green sand thereof and 'in this way 4 coresthe combination with a core-box hav- .1ng a plurality ofcore-formingcavities therein, and opposite openings leading into saidcore-box cavities and a sand-boot to sai sand-boot'arranged tosimultaneously I deliy'erithe sand through said openings intosaldcavitiesin opposite directions and 'in' a-paths parallel to thelongitudinal'axes of the multiple cores formed in said core-box.

7. In apparatus for making reen sand coresthe combination withacoreoxhaving an opening leading thereinto and a sand-boot 10 to supply sand tosaid core-box, of a drop tube or blow plug on said sand-boot arranged todeliver the sand through said opening into said core-box in a pathparallel to the longitudinal center of the core in 15 making the core.

8. In apparatus for inaking green sand copies of this pateiit may beobtained su sand to said core box, of means on through said'openingsinto said cavities in paths parallel to the longitudinal axis or themultiple cores formed in said core-box; In testimony whereof, I havehereunto set my hand.

JOHN C. BANNISTER. Witnesses:-

Fnnn J. TALBO'1'I,. A. F. HARRISON.

for in cents each, by addressing the "Commissioner of Patentl,

'Washington, D. (2.

